Segregation and solid evolution during the solidification of niobium-containing superalloys

被引：0
|
作者：
Yang, WH [1 ]
Chen, W [1 ]
Chang, KM [1 ]
Mannan, S [1 ]
deBarbadillo, J [1 ]
机构：
[1] W Virginia Univ, Morgantown, WV 26506 USA
来源：
SUPERALLOYS 2000 | 2000年
关键词：
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A macrosegregation defect, commonly termed freckle, has limited the maximum diameter of remelted ingots of some Nb-strengthened nickel base superalloys. Two aspects of freckle formation were studied in three commercially important superalloys 718, 706 and 625. 1) the segregation characteristics which provide the driving force for freckle formation; 2) the solid development in the mushy zone which provides resistance to the flow inducing the defect. A Rayleigh number form freckle criterion that considers the effects of composition is derived. Freckle tendency of the alloys was evaluated using the experimental results.
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页码：75 / 84
页数：10
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